Manufacture of tubular rivets



BRAY.

(No Model.)

MANUFACTURE OP'TUBULAR RIVETS.

Patented Apr. 11, 1882.

% Inventor: y

Attorney.

N. PETERS Photo-Lithograph". Wzihingion. D C.

UNIT STATES PATENT OFFICE.-

MELLEN N. BRAY, or nos'ron, MASSACHUSETTS.

MANUFACTURE TUBULAR RIVETS SPECIFICATION forming part of Letters PatentNo.'256,11'7, dated April 11, 1882.

Application filed February 13, 1882. (No model.)

To all whom it may concern Be it known that I, MELLEN N. BRAY, of

Boston, in the county of Suffolk and State of Massachusetts, haveinvented certain new and 'usei'ul Improvements in the Manufacture ofTubular Rivets, of which the following, taken ing or rolling a portionof said blank into the form of a tube or hollow cylinder, turning downthe other portion of said blank into a position at right angles to theaxis of the tube or hollow cylinder, and at the same time turningoutward a portion of that end of said tube which originally formed themiddle portion of the blank, so as to form an outwardly-projectingflange, swaging that portion of the blank that was not rolled into thetubular form, so as to make it slightly concavo-convex, turning saidconcave-convex portion of the blank over upon the flanged end of thetube, with the convex side outward, turning its outer edge downwardaround the flange of the tube and then inward beneath said flange, andthen swaging the head of the rivet in suitable dies to firmly lock theparts together and correct any irregularity in the shape of the head.

Figures 1 and 2 of the drawings are respectively a plan and edge view ofthe blank as it is punched from the sheet of thin metal. Fig. 3 is anelevation showing the blank after a portion of it has been rolled intothe form of a tube. Figs. 4 and 5 are respectively a plan and a sideelevation of the same after the cap portion of the blank and aportion ofthe walls of the tube have been turned outward or at right angles to themain body of the tube. Figs. 6 and 7 are respectively a plan and acentral vertical section of the same after the cap portion has beenswaged into a concavoconvex form. Figs. 8 and 9 are respectively I aninverted plan and an elevation of the same after the cap portion hasbeenturned over upon the flanged end of the tube and turned down around saidflange. Fig. 10 is a verti cal section on line a :10 on Figs. 8 and 9.Figs. 11, 12, and 13 are respectively an inverted plan, an elevation,and a central vertical section of the finished rivet; and Figs. 14 and15 are respectively an inverted plan and a central vertical section of apiece of leather with my improved rivet set therein.

In the manufacture of my improved rivet I first cut or punch from sheetmetal the blank A, having out therein the slits or incisions a,

b, and 0, arranged as shown in Fig.1. I then at right angles, or nearlyso, to the main body of the tube. The section A is then subjected to theaction of swaging-dies to render it concavo-convex, as shown in Figs. 6and 7. The cap-section A is then turned over upon the flanged end of thetube, and its edges are turned down around the edge of the flange d, asshown in Figs. 8, 9, and 10, and then by the next and final operationthe edge of said capsectiou is turned under the flange d, and the rivetis completed. This makes a very good rivet, capable of cutting its ownway through the material and retaining the core out from the materialwithin the hollow of the tube, as shown in Fig. 15, at a comparativelysmall cost. The slit 0 and the joint in the tube opposite thereto willcause the rivet to clinch in two parts, as shown in Fig. 14.

What I claim as new, and desire to secure by Letters Patent ot' theUnited States, is-

1. The blank A, cut in the form shown, and provided with the slits orincisions a, b, and c, from which to form a tubular capped headed rivet,substantially as described.

2. The process of forming tubular rivets from sheet metal by firstcutting a blank to the form shown in Fig. 1, and forming therein theslits or incisions a, b, and c, bending or rolling one section orportion of said blank into the form of a tube, turning or bending theother sectionor portion of said blank and a portion of the end of therolled-up or tubuder said flange, substantially as and for the 10 larsection outward at right angles, or nearly purposes described.

so, to the axis of the tube, swaging the sec- Executed at Boston,Massachusetts, this 9th gion sobturlned outgard into a concave-convexday of February, A. D. 1882.

orm, en ing sai eoneavo convex section over upon the flanged end of thetubular sec- MELLEN EBAY tion to form a cap thereto, and turning the outWitnesses er edge of said cap-section down around the E. A. HEMMENWAY,edge of the flange of the tube and then un- WALTER E. LOMBARD.

